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Tantalite

Chemical compound
The mineral group tantalite [Ta₂O₆] is the primary source of the chemical element tantalum, a corrosion resistant metal. It is chemically similar to columbite, and the two are often grouped together as a semi-singular mineral called coltan or... Wikipedia
Category: Oxide minerals
Cleavage: Good in one direction
Color: Dark black, iron-black to dark brown, reddish brown
Crystal class: Dipyramidal (mmm); H-M symbol: (2/m 2/m 2/m)
Crystal system: Orthorhombic
Formula (repeating unit): (Fe,Mn)Ta2O6
Fracture: Subconchoidal